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...this double-boiler idea, you could make something like a cross between a coffee filter and a double boiler. It could be faked with two metal funnels, one larger than the other, and a bit of modification to them.

Then it could operate even when it was colder in the room than the melting point, it would just draw more power. A miniature heating coil in the water would be all you'd need for heating the water, and if you added both a digital temperature gauge to the water and the inside of the chocolate c

I was thinking more of a cylindrical container of water. And great minds think alike - my plan was to use a 12V cup immersion heater, the sort that plug into car cigarette lighter sockets. I'm not sure about automatic temperature control circuits yet - initial plan was to do it by eye with a 0-12V model railway controller (which I'm going to retrieve from my parents at the weekend). I'd like to get the mechanics right before automating it. Or more likely passing it on to someone here who is more excited by